"Truth" in a general sense, or a particular one? The latteras it applies to science? religion? history? politics? something else? ThisHumans involved? Yes other mammals? reptiles? insects? anything else? No

So the police tries to find out the truth about something illegal. Something criminal? Did the police initially know an illegal act was committed? Or did they rather notice something unusual and choose to investigate?

The big "NO" about someone telling a lie: Did someone simply tell the truth? And this sounded incredible? Sounded like a lie? Did somebody confess to a crime?

So the police tries to find out the truth about something illegal. Yes Something criminal? Yes Did the police initially know an illegal act was committed? Or did they rather notice something unusual and choose to investigate? Irrel how they found out

The big "NO" about someone telling a lie: Did someone simply tell the truth? Yes And this sounded incredible? No Sounded like a lie? No Did somebody confess to a crime? Yes

Is the person who confesses to the crime an adult? Yes Male? No, so I have fixed the pronounsDoes she confess directly to the police? Who interrogate her? Because of the crime she confesses to? Will she be punished for the crime? Yes to all

Multiple murders - 2? 3? 4? 5? More? Did she commit all relevant murders? Did she kill her husband? Her child or children? Parents? Other relatives?

Did she confess of the crime because she thought it was useless to deny it? Because she was proud to have done it? Because she thought she deserved to be punished? Because she was tired of life anyway so she didn't mind to be executed? Because of some consequences her confession would have for others? Because she hoped to be punished only lightly?

Multiple murders - 2? 3? 4? 5? More? Five Did she commit all relevant murders? Yes Did she kill her husband? No Her child or children? No Parents? Yes Other relatives? Yes

Did she confess of the crime because she thought it was useless to deny it? Because she was proud to have done it? Because she thought she deserved to be punished? Because she was tired of life anyway so she didn't mind to be executed? Because of some consequences her confession would have for others? Because she hoped to be punished only lightly? No to all

Was there already evidence suggesting she was guilty before she confessed? Irrel Did the police know she had done it? Irrel If she had not confessed, would she have been found guilty? Irrel

Did she confess as soon as the police started to question her? Yes Did she confess to all 5 murders? Yes Were the other murders grandparents? Siblings? Siblings Uncles? Aunts? Cousins?

Did she know that she would be punished if she confessed? Yes Was she mentally normal? Assume Yes, but not "normal"-normal. She did commit five murders, after all. But she was sane Did she think she would gain something from confessing? No Relevant how she will be punished? No Jail? Execution?

Is her age relevant? No Under 18? Probably notDid she have any other siblings that she didn't murder? Irrel Or other close relatives? IrrelWas she living with the victims? Assume Yes And nobody else? Ditto

Is it relevant how long after the fact she confessed? Yope Did she feel better after commiting the murders? Yes Did she expect to? YesWas she dying to get it off her chest? No

Did she make the confession all by herself, Yes or was it revealed through a "medium" (such as a talking object)?

Is it relevant how she killed them? Why she killed them? When she killed them? Were they all killed at the same time? Were they mistreating her? Depriving her of something? Controlling certain aspects of her life?

Is it relevant how she killed them? Why she killed them? When she killed them? Were they all killed at the same time? Were they mistreating her? Depriving her of something? Controlling certain aspects of her life? Does she have a significant other? Did she have to kill all 5 of them to feel better? Was anybody else a suspect? Someone she cared about? All irrel; focus on the confession

Are we missing a relevant attribute about her such as her job? her hobbies? her physical health? her social circle? Is she famous? These are irrel

If someone else would have asked her instead of the police, would she also confess? Yes -- good question

Is the information in her confession relevant? Does she answer all possible questions about the case? Yes -- another good question. Specific information, though, is not relevant Or could it just be "I did it"?

About a maid I'll sing a song, Sing rickety-tickety-tin, About a maid I'll sing a song Who didn't have her family long. Not only did she do them wrong, She did ev'ryone of them in, them in, She did ev'ryone of them in.

One morning in a fit of pique, Sing rickety-tickety-tin, One morning in a fit of pique, She drowned her father in the creek. The water tasted bad for a week, And we had to make do with gin, with gin, We had to make do with gin.

Her mother she could never stand, Sing rickety-tickety-tin, Her mother she cold never stand, And so a cyanide soup she planned. The mother died with a spoon in her hand, And her face in a hideous grin, a grin, Her face in a hideous grin.

She set her sister's hair on fire, Sing rickety-tickety-tin, She set her sister's hair on fire, And as the smoke and flame rose high'r, Danced around the funeral pyre, Playin' a violin, -olin, Playin' a violin.

She weighted her brother down with stones, Rickety-tickety-tin, She weighted her brother down with stones, And sent him off to Davy Jones. All they ever found were some bones, And occasional pieces of skin, of skin, Occasional pieces of skin.

One day when she had nothing to do, Sing rickety-tickety-tin, One day when she had nothing to do, She cut her baby brother in two, And served him up as an irish stew, And invited the neighbors in, -bors in, Invited the neighbors in.

And when at last the police came by, Sing rickety-tickety-tin, And when at last the police came by, Her little pranks she did not deny, To do so she would have had to lie, And lying, she knew, was a sin, a sin, Lying, she knew, was a sin.

My tragic tale, I won't prolong, Rickety-tickety-tin, My tragic tale I won't prolong, And if you do not enjoy the song, You've yourselves to blame if it's too long, You should never have let me begin, begin, You should never have let me begin.

I know I'm not the only one who found it hilarious that a woman who'd just committed five murders believed lying was wrong.

Nice work Enjay for the solve. Also nice work to Vene, Mimino (welcome back to the forum, both of you), Alhucema, Shez, Markobr, Solitaire, and a partridge in a pear tree.